Load-brake device



oct. 4, 1927.

cc. FARMER ET AL LOAD BRAKE DEVICE Filed Jan. 2, 1926 Y'Patented' Oct. 4, '1927.

MTE

T OFFICE- CLYEE c. FARMER, 01E PITTSBURGH-,erm THe-Mas mnoivzas, oEEneEwooD, PENN- 'sYLvANIA, Assreivons 'nofrnEivEs'rmeHoUsE am. E

MEEDING, PENNSYLVANIA@,consonancia OEPEEESIZLVANIA. .j

Y Ireen-fBRAKE. DEvcE., t

Application med January'. 2,1926.' serialip; vaise( .This invention relates to a' fluid pressure l brake apparatusy of the type inwhich the brakes maybe applied with greaterpower on a loadedcar than'on an. empty carl.v

One object ofour invention to'provide meansA for supplying fluid under` pressure to v ment embodying our inventiongFig. 2 a sec-4 braking.

tion on the line 2-2 of Fig.' Spasection on the line S-Sof Fig, 1;l and Figlia partial end view, with'thefcasing removed,v

of the manually operated means for setting the apparatus either for empty or loaded cary The apparatusvshownin Fig. 1 of the drawing comprises a triplevalvel device 1,A

or other valve 'device adapted to ycontrol the admission and exhaust of fluidv under pres.-V

A sure to and from a brake cylinder,an empty car brakecylinder 2, Valoaded car'brake cylinder 3, and a combinedV manually controlled. valve device andjloa-d brake i cylinder controlling valve device t. v v

The brake cylinder piston rod 5 of the brake' cylinder Zis. connected to. a brake lever 6, through which power is transmitted to applythe brakes to the wheelsv of the car in the usualmanner. The ro'du is also connected to a brake lever 7, through which the load bra-kecylinder 3, transmiltsrpower' to apply. the, brakes.

\ The load brake cylinder- 3 contains a brake cylinder piston 8 adapted.'` to operate piston rod` 9, and interposed between thejrod 9 and the brake lever 7 isy a take-up mechanism comprising *a rackV bar- 10v having vone end pivotally connected to lthe.l`evers 7' andprovided withteeth 12 adapted tomesh v vithAV theteeth ofagear 13. i i

l Y The. gear 1B secured to a stub shaft '14 ha-ving bearings in acasing 1 5, which is secnred tothebrake cylinder' 3 the. rack bar 10 being guided in-itsmovement by] engagef4 ment with rollers 16,-"w`hich`are rotatably mounted inthe casing'inpairs,y with thebar .f

disposed between thegrollers o-feachpair. `l Also se'cured` to the shaft 14 `is,y a ratchet wheel" 17 and connectedito fthe end' ofl the piston rod 9 atopposite sidesy by a pivot pin 18`are links 19 and 20; which havebearings on; the shaft yat theiropposite ends,l so that the links support the end' of thefpi'ston rod and c auseit to move in thefarc-"of` about theaXis of' the shaft 145..

rlhe endll of the'pisto'n'rod 9'y is hifiira cated and 'in the space' so formed'v and` mount- .ed on the pin18`-, is a ratchet pawl; member 21' j having'a ratchet tooth QEZada'pted lio-engage the teeth of the ratchetvvheel--1'7L` v` The ratchet Whe'ellf is providedlvvithfan a circle annular', recess 6'0 into which .extends a lug 61", formed on the p'awlI member V21, said having.y a blunt tooth 62 adapted. to grip the internal annular face of r the ringportionof the ratchet wheel ,fl'vvhen thel tootlZQ engages withnthe" the teethof saidA wheel. In

theV extended portionof'the pawl memberQl which carries the lugla. socket provided in. whicha coil springA V25 k is disposed. lSaid j i spring acts against theV head ofa1pinv24,

which in turn engages'a lug; 25 carried by. the link 2O,v sothat when the pavvl Vmember the spring-to cause: the tooth" 22' to engage I the teeth of theratfchet wheel'f1j7l' The pawl member 17 is'provid'ed witharelease finger 26' which is adapted. tobem'oved with the.'

pawl member 17 upon the release.. movement ofy the piston. rodi9 to; engage a lugg27wcarv ried by the casing l\1 5,`-so asto shi ft.fl1e pawl member and cause theftooth ZQ'tQEbQthrown l out of 'engagement with the te ratchetrwheel 17, against vthe `re the springQS i In the, valvedver 4fi'S: provided valve pister; Qassam-nato. seat in Qppfst dass;

tions" and'subject' to the pressiiref-Of a 'coil Y spring 2,91 A. Dort 30 lea-ds.fromtheflaibeatth outer. lower: Seatedarea of" the valvepigfgii 28.' and is ,connected through a. pipe 31 with the piston chambers@ @faire road ,bfakgeyi of the i Vme i 1y-'and opens intov the clamberf The" tfeethiofIl said lglgeair -segment 1 mesh.V Withf v the teeth cf` another. gearsegment 38fvvhich lis*'securedsto an1operating shafti'39ufhaying labearingginlthe casinggflO which'fencloses *therotary valve mechanism. h The shaft, 3 9v 'extends out through `thef'casing iii-opposite j directions, and is 'rovi-ded vat each V'end with" 1 amaiiuallyfeperable handle 41,)soj thatfthe v Jumet-ary valvemaydbetoperated from either [side-of thefcar. -.It sholdbe understoodthat the valve?deviceV '4g is shown.V as VVa Vdis- Y` fsectiolri-` in the drawing, llfor the sake u of? lcarness, andi that the actualluposition of V. -thl= f Yparts, such.; [as the 3 member 46, is l such i [that thyedonot interfere with thezexten ffsionlpf he'fshaft V39ffrom"oneside ofthe i .135 partusffor! loadedfear braking', the Vhandle 4:1 is "operated to. 'rotatethef stem', 36 through rthegearfseg1nents 3B-.zand 37 to the load po ljsition, in"r`rvl1`ic1i `thepin portionlQ imposif tivelyA engages-inthe ,notch '56,` as shown in 3.1 1n`this posit-ion, a port 53 yin the rotaiiv vs ilveve connectschamber 35 with f which leads to chamber 55,open `itoftheinner'seated area `of, the valve piston v [Thelchamber 351s connectedftopipeh isf. open-topipe 57, through which f y e' Huidunder VY'pri-sssure isf supplied by operation 'ofthetriple yalye devicel tothe;` empty 7 faolchmberazga fWhehthepressure With the spring chamber 33, and communilply thejbrakes With a. pressure proportional .to the pressure Vin the brake cylinder2. The llever 7 isfalso, moved about its y-ulcrum pin' 63, so that the rackbar 1QV is movedtoward the'right.'`

In the' release positionof` theload'brake su cylinder piston 8, as shown in :'Fig. 1, Vthe finger 26 engages tl1e-lug27,1so-that the pavvl member 21 is' held in itsrelease position, vvWithlthe paWl 22 out of engagement With the ratchet Wheel 17 and consequently the'ratchet Wheel 17 and the gear 13 are free to rotate., Astlie rack bar fl() ymoves to the right, ,the gear 1311sy therefore rotated.

``When fluidl under pressure is supplied tothe load brake cylinder 3, as',hereinbetore'defl scribed, however, the piston 8 vis moved out; g

wardlyand thepiston rod 9 rocks the pawl member 21,111 al counter-clockwise direction, Y

so that the linger 26 is moved away from the" rlugl 27, permitting 'thel spring 23 toi act through the pinf21landagainst'the lug 25, to thereby-cause the'pa- Wl ymember 21 to bei y shiftedandthe tooth V22A to yengage the 4teeth of the ratchet Wheel 17 andthe toothv 62 to grip the internal annular face of the ratchet'l Furthermovement ofthe load brake 'cylin'd'er piston 8 and the piston rod 9 then op- 'Y crates tofrotate vthe: ratchet Wheel 17 v'and ythereby thefgear 13, so that the rack bar 10 is pulledtoWar-d the'ri'ght and therebythe brakesv are applied With yincreased power,

due tothel pressuretransmittedffrom the load brake cylinder. f v

' Whenthe brakes are released,"fluid under pressure isureleased` `froml the empty `brake cylinder2 and' also from thefload brake cylinder 3, tl1rou'gh`ipipes 56 and 57,

and when .the pressure zhas. fallento laprej Vdetermined degree, for example, five pounds, the valve piston 28 will move from its' upper Seat, and Will'open vthe port 30 tothe spring Inl the 1oWer seated position of. thejvalve chamber 33, `so'that brake cylinder V'pressurewill then'be admitted to said vchamber to "cause a quick vand positive snap-like-moveyment, of the valve piston to its 'loWers'eatL 'f piston :28, fluid under pressure remaining "in the loadv brake cylinder?) will be released lby fvvay of .port 30,

spring chamber 33 and yexhaust port'58-y i Y. As the load brake Vcylinder-piston8y moves'iri Y to release position, thel finger 26 engagesthe ,i lug 27 and thereby causes they pawl member,

loof* 121 tdbe shiftedrso as te release thetooth 22 1w Y from engagement i'vith the ratchet Wheel 17,

Vin readiness for the neXt brake application.

*It it is desired to cut the loadl brake out oit action, the handle 4l is turned to the empty car position, in which .the sleeve 43 is rotated so that the pin portion 49 engagesv vin the notch 51.l The rotary valve 34 isthen rotated to a position in which communication from pipe 56 to chamber 55is cut olf and' in order to prevent possible accumulation of fluid pressure in chamber 455 by leakage, the 'passage 54 may be connected'to an eX- haust lport 59, in this position, throughV a cavity-(not shown) in the rotary valve 34.V

Having novv ydescribed our invention,

' what We claim as new and desire to secure valve means for controlling communication through which fluid from the emptybrale cylinder `is supplied to said-valve device..

2. in a load brake apparatus, the combination with an empty brake ,cylinderV and a brake lever operatively connected ,to said brake cylinder, -ot a load `brake cylinder, a

` I toothed bar operatively connected to said 'f to the load brake cylinder brake lever and a gear operativelyconnected the teeth of said bar. u

8. In a load brake apparatus, the combivnation! Witha load brake cylinder, a piston therein, and a pistonstem operable by said piston, of a vtoothed bar ythrough Which power isy transmitted to apply the' brakes, a gear meshing Withtheteeth of said bar,

and means operatively connected-to said stem and meshing With for rotating said gear upon movement, of

said piston. r 4 v i. u

4. In a load'brake apparatus, the combinationwith `a load brake cylinder, a piston f therein, and a vpiston rod! operable by said piston, of a toothed bar for transmitting power to operate the brakes, a gear meshing With the teeth of said'bar, amember rotatable with saidgear, avpavvl `operated by said..

piston rod forrotating saidmembenand means for releasing said pavvlfromopera- 55 tive engagement with said member` upon movement of saidpiston to release posltlon.

5. In a load brake apparatus, the combif nation with a load` brake cylinder,"a piston therein, and a piston rod operable. by said piston, of a toothed bar for transmittingl power to operate the brakes', a gear meshing With the teeth-ot said bar, a ratchet Wheel `v l rotatable With said gear,- and a paWl pivot- Sd ,Wheel upon movement otsaid piston rod by said piston. -V

Vally connected to saidV piston rod for engagi i l ing thev teeth of said ratchet Wheelto rotate 6Fkv 6. In a load brake apparatus, the'combi-i.y

nation With a loadbrake cylinder, a piston therein, and a piston rodoperable by said;

piston, lot' a toothedv barrforwtransmitting power .to operate the brakes, a gear meshing With theteeth of vsaid bar, a ratchet Wheel fvrotatable With said gear, a-pavvl pivotally Vconnected to said piston rod for engaging the teeth of `saidratchet Wheel. to rotate saidV Wheel `uponmove'ment of saidpiston rod by said piston, and means for releaslngsaidVv `pavvl` from, engagement with 4said -vratchet Wheel upon movement of said piston torelease position. u, Y

In testimony. `whereof We have hereunto set our hands. v

oLYDE c. FARMER; mHoMAscH, THovMl/rsj 

